Examples of errors detected by the V763 diagnostic

V763. Parameter is always rewritten in function body before being used.

Inkscape

V763 Parameter 'new_value' is always rewritten in function body before being used. sp-xmlview-tree.cpp 259

void element_attr_changed(.... const gchar * new_value, ....)
{
  NodeData *data = static_cast<NodeData *>(ptr);
  gchar *label;

  if (data->tree->blocked) return;

  if (0 != strcmp (key, "id") &&
      0 != strcmp (key, "inkscape:label"))
        return;

  new_value = repr->attribute("id"); // <=
  ....
}

Similar errors can be found in some other places:

• V763 Parameter 'widget' is always rewritten in function body before being used. ruler.cpp 923

ReOpenLDAP

V763 Parameter 'rc' is always rewritten in function body before being used. tls_o.c 426

static char *
tlso_session_errmsg(...., int rc, ....)
{
  char err[256] = "";
  const char *certerr=NULL;
  tlso_session *s = (tlso_session *)sess;
  rc = ERR_peek_error(); // <=
  ....
}

Chromium

V763 Parameter 'index' is always rewritten in function body before being used. tab_strip_model_experimental.cc 314

void TabStripModelExperimental::InsertWebContentsAt(
    int index,
    content::WebContents* contents,
    int add_types)
{
  .... // the index argument is not used

  index = tab_view_count_ - 1;

  ....
}

The value passed in the index argument is not used.

NCBI Genome Workbench

V763 Parameter 'w1' is always rewritten in function body before being used. bmfunc.h 5363

/// Bit COUNT functor
template<typename W> struct bit_COUNT
{
  W operator()(W w1, W w2)
  {
    w1 = 0;
    BM_INCWORD_BITCOUNT(w1, w2);
    return w1;
  }
};

LibreOffice

V763 Parameter 'nNativeNumberMode' is always rewritten in function body before being used. calendar_jewish.cxx 286

OUString SAL_CALL
Calendar_jewish::getDisplayString(...., sal_Int16 nNativeNumberMode )
{
  // make Hebrew number for Jewish calendar
  nNativeNumberMode = NativeNumberMode::NATNUM2;

  if (nCalendarDisplayCode == CalendarDisplayCode::SHORT_YEAR) {
    sal_Int32 value = getValue(CalendarFieldIndex::YEAR) % 1000;
    return mxNatNum->getNativeNumberString(...., nNativeNumberMode );
  }
  else
    return Calendar_gregorian::getDisplayString(...., nNativeNumberMode );
}

Similar errors can be found in some other places:

• V763 Parameter 'bExtendedInfo' is always rewritten in function body before being used. graphicfilter2.cxx 442
• V763 Parameter 'nVerbID' is always rewritten in function body before being used. oleembed.cxx 841
• V763 Parameter 'pCursor' is always rewritten in function body before being used. edlingu.cxx 843
• And 2 additional diagnostic messages.

Stellarium

V763 Parameter 'updatePos' is always rewritten in function body before being used. StelGuiItems.cpp 690

void BottomStelBar::updateText(bool updatePos)
{
  .... // the index argument is not used here
  updatePos = true;
  ....
}

Haiku Operation System

V763 Parameter 'menu' is always rewritten in function body before being used. video.cpp 648

bool
video_mode_hook(Menu *menu, MenuItem *item)
{
  video_mode *mode = NULL;

  menu = item->Submenu();
  item = menu->FindMarked();
  ....
}

Similar errors can be found in some other places:

• V763 Parameter 'force_16bit' is always rewritten in function body before being used. ata_adapter.cpp 151
• V763 Parameter 'force_16bit' is always rewritten in function body before being used. ata_adapter.cpp 179
• V763 Parameter 'menu' is always rewritten in function body before being used. video.cpp 264
• And 16 additional diagnostic messages.

GCC

V763 Parameter 'off' is always rewritten in function body before being used. ipa-polymorphic-call.c 766

bool
ipa_polymorphic_call_context::set_by_invariant (tree cst,
            tree otr_type,
            HOST_WIDE_INT off)
{
  poly_int64 offset2, size, max_size;
  bool reverse;
  tree base;

  invalid = false;
  off = 0;
  ....
  if (otr_type && !contains_type_p (TREE_TYPE (base), off, otr_type))
    return false;

  set_by_decl (base, off);
  return true;
}

Command & Conquer

V763 Parameter 'coord' is always rewritten in function body before being used. DISPLAY.CPP 4031

void DisplayClass::Set_Tactical_Position(COORDINATE coord)
{
  int xx = 0;
  int yy = 0;

  Confine_Rect(&xx, &yy, TacLeptonWidth, TacLeptonHeight,
    Cell_To_Lepton(MapCellWidth) + GlyphXClientSidebarWidthInLeptons,
    Cell_To_Lepton(MapCellHeight));

  coord = XY_Coord(xx + Cell_To_Lepton(MapCellX), yy + Cell_To_Lepton(....));

  if (ScenarioInit) {
    TacticalCoord = coord;
  }
  DesiredTacticalCoord = coord;
  IsToRedraw = true;
  Flag_To_Redraw(false);
}

Similar errors can be found in some other places:

• V763 Parameter 'coord' is always rewritten in function body before being used. DISPLAY.CPP 4251

MuseScore

V763 Parameter 'y' is always rewritten in function body before being used. tremolo.cpp 287

void Tremolo::layoutOneNoteTremolo(qreal x, qreal y, qreal spatium)
{

  bool up = chord()->up();
  int line = up ? chord()->upLine() : chord()->downLine();
  ....
  qreal yLine = line + t;
  ....
  y = yLine * .5 * spatium;

  setPos(x, y);
}

GCC

V763 Parameter 'flags' is always rewritten in function body before being used. call.cc 994, call.cc 981

static conversion *
build_aggr_conv (tree type,
                 tree ctor,
                 int flags,                               // <=
                 tsubst_flags_t complain)
{
  unsigned HOST_WIDE_INT i = 0;
  conversion *c;
  tree field = next_aggregate_field (TYPE_FIELDS (type));
  tree empty_ctor = NULL_TREE;
  hash_set<tree, true> pset;
  flags = LOOKUP_IMPLICIT|LOOKUP_NO_NARROWING;            // <=
  ....
}